If dried grains are stored in a silo for a long period of time and the bottom layer of the grain is spoilt due to accumulation of moisture, then the reason for this spoilage is that the grain, in comparison to the outside air, is

A. Frog B. Mould Board C. Land Side D. None of these

A. Depth of bed B. Porosity of the bed C. Density of the particles D. All of the above

A. To carry the seeds and fertiliser in separate compartments B. To open furrows at uniform depth C. To cover the seed and fertiliser D. All of the above

A. Zero B. Positive slip C. Negative slip D. None of these